Page "Electrochemistry" Paragraph 87
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If the second electrode is also at standard conditions, then the measured cell potential is called the standard electrode potential for the electrode.
The polarity of the standard electrode potential provides information about the relative reduction potential of the electrode compared to the SHE.
If the electrode has a positive potential with respect to the SHE, then that means it is a strongly reducing electrode which forces the SHE to be the anode ( an example is Cu in aqueous CuSO < sub > 4 </ sub > with a standard electrode potential of 0. 337 V ).
Conversely, if the measured potential is negative, the electrode is more oxidizing than the SHE ( such as Zn in ZnSO < sub > 4 </ sub > where the standard electrode potential is − 0. 76 V ).
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